Here's a
picture of icebergs, bergy bits, growlers and even smaller bits of ice.
There are standard definitions for how large ice has to be to be called
an iceberg, and also for what smaller bergs are called. Basically, an iceberg
has to be more than 5m above sea level, a bergy bit is about 1-5m above
sea level and growlers are smaller bits of ice. They all have to orginate
from glaciers or an ice shelf (taken from the
National Ice Center FAQ). At Rothera Research Station ice does break
off glaciers and depending on the wind direction ice can fill up the surrounding
bays, like in the photo below.